<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <style>
        .zong{
            /* overflow: hidden; */
            height: 1000px;
            width: 1000px;
            margin-top: 110px;
        }
       .dh{
        height: 300px;
        width: 300px;
        background-color: antiquewhite;
        /* margin: 20px; */
       }
        
       .xdh{
        height: 300px;
        width: 300px;
        background-color: aquamarine;
        margin-top: 20px;
        overflow: hidden;
       }
       .xh{
        height: 100px;
        width: 100px;
        background-color: blue;
        margin-top: 20px;
        
       }
        
    </style>
    <div class="zong">
    <div class="dh">
        <div class="xh">首都经济</div>
    </div>
    <div class="xdh">
        <div class="xh">首都经济</div>
    </div>
    </div>
</body>
</html>                                                                                 